Electric bell.



PATENTED MAY 1, 1906.

J. ERIGKSON. ELECTRIC BELL. APPLICATION FILED OCT. 31, 1904.

frzi/rziar: flue/o n mum kw FEED STATES FAYETTE? tlll l ltl JCHN ElilCKSON, OF CHICAGO, ILLINOIS, ASSlGNOh TO AUlOMA'llC ELECTRIC COB'IPANY, OF CHICAGO, lLLlNOlS.

ELECTFHC BELL.

Specification of Letters Patent.

.ratented May 1, 1906.

Application filed October 31,1904. Serial Na 230,756.

To al whom it may concern:

Be it known that 1, JOHN ERICKSON, a citi zen of the United States of America, and a resident oi Chicago. in the county of Cool; and State of Illinois, have invented a certain new and useful improvement in Electric Bells, of which the hillowing is a specification.

My invention relates to electric bells in general, but more particularly to bells of that type which are generally known as polarized' bells, and especially to bells in which some provision is made for adjusting or varying the distance between the armature and the cores of the clectromagncts.

Generally stated, the object of my invention is to provide an improved and highly-efficient electric bell; and a special object is to provide an improved construction and arrangement for adjusting the armature toward and away from the cores of the electromagnets; and another object is to obtain this relative adjustment between the electromagnet and its armature by adjustably mounting the armature upon the adjacent pole of the permanent magnet; and a further special object' is to provide an improved construction and arrangementwhereby the said adustment may be obtained through the medium of a spring upon which the armature is mounted and which is adapted to be flexed toward and away from the electromagnet by means of an adjusting-screw; and it is also an object, of course, to provide certain details and fea tures of improvement tending to increase the general elliciency and serviceability of an electric bell of this particular character, as will hereinafter more fully appear.

In the accompanying drawings, Figure 1 is a front elevation of an electric bell embodying the principles of my invention, the gong or resonating portion of the device being omitted for convenience of illustration. Fig. 2 is a side elevation of the device shown in Fig. 1. Fig. 3 is a top View of the device shown in Fig. 1. Fig. 4 is a perspective of the armature,-'thc armature -mounting, and.

the portion of the permanent magnet to which the said mounting is secured.

As thus illustrated, my invention comprises a pair of electromagnets A, having the lower ends of their cores a suitably secured to a bracket-plate B. The lower pole-piece of l i 4 l the permanent magnet is secured to thrmiddle portion ol' said lnacltet-plate by means oi a strap or clampingpiec I). A. U shaped spring P has one of its parallel portions secured in a ho izontal position to the upper pole or end portion oi the said permanent imignct. This is preferably accomplished by means ol a strap or clamping-plate -(Z. The said U-shapcd spring has its other parallel portion provided with a couple of cars (1" and Between these two cars the armature E is pivotally mounted upon concshaped portions (i and 41, secured, respectively, to the said cars. It will be observed that the cone-shaped portion (1 is provided by the tapered end oi a screw held in its desired position by a lock-nut d. The striker F is secured to the armature in a suitable manner. l l ith. the arrangement shown the two end portions of the said U-shapcd spring are connected by an adjusting screw G. With this provision it is evident that the lower horizontal portion of the said U-shaped sprin can bc llexed toward and away from the e ectroinngnet. In this way the :lIIllfk ture, which carried b the said spring, can be adjusted toward an away from the cores of the electrnroagnet. .In other words, and broadly con idered, the armature is adjustably mounted on the adjacent pole of the permanent magnet. More specifically considered, a flexiblearmature-mounting is cinploycd as the medium of connection between the armature and'the permanent magnet. As

shown, the said spring and its strap or clamping-piece d are secured together by screws (1. In a similar way the bracket-plate B and its strap or clamping-plate b are secured together by screws b, extending through the some and into the cores of the electroinagnet.

It is obvious that the spring D can he so tcnsioned or sprung as to keep the head or shoulder of the adjusting-screw G constantly in contact with the upper end portion of said spring. In this way the screw can be tightsued for the'purpose of moving the armature away from the electromagnet cores and can be simply loosened in order to effect an adjustment of the armature toward the electromagnets In such case the tension of the spring is exerted to move the armature toward the electromagnets, while the normal justrnentof the armature in' the opposite di electromagnet, the armature being disposed between .thespring and-magnet.

2. An electric bell comprising a pa r of :electromagnets, a bracket to which the cores tromagnets, said armature being of said magnets are rigidly secured, apermanent magnet havin one pole rigidly se-' cured to said bracket, and an armature for said eleetromagnets, .said armature being. ad'- justably mounted upon the other pole ofsaid permanent 'magnet, togetherwith means also carried by the permanent magnet for adjusting the armature toward and away from the electromagnet, the armature being disposed between thesaid armature-adjusting means and-magnet.

. 3. -An electric bell comprising an electro magnet, a permanent magnet, an armature. for said electromagnet, a flexible armaturemounting carried by the permanent magnet and to which the said armature is pivotally secured, and an adjusting-screw for flexing said mounting and thereby moving the arma ture toward and away from the electromagnet, the armature being disposed between the" said mounting and magnet.

a. An electric bell comprising a permanent magnet, a pair of electromagnets having their cores rigidly-secured to one pole of said permanent magnet, a U-shaped spring secured to the'other pole of said permanent magnet, one side portion of said U'-shaped spring being left free and positioned between-the electromagnet-cores and the adjacent pole ofthe permanent magnet, an armature-for said'elecpivotally mounted uponthe free portion of said spring, and a screw connecting the end portions of said spring, whereby the said armature may be moved toward and away from the cotes'of the electroinagnets' I 5. The combination of a perinanent "i'nagnet, a pair of electromagnets having their cores rigidly nianent magnet, an armature for said electhe end? portions of said away from each other, and thereby movin the armature towardand cores, a permanent magnet constituting amedium of rigid connection between one side of said spring and the rigidly-connected end portions of'the said cores.

ing the armature 'tions of said" spring,

secured to one poleof said pertromagnets, spring means tensioned to move slejoee the armature toward the cores. of the electromagnets, andscrew-threadd-Jmeans for opposing the tension of said springmeans and .moving the armature theelectroma'gnetsz awayfrom the cores of 6. The combinationof apairbfelectro-K magnets having their cores ri connected atone end, an armature for t eother-ends of Said cores, a U-shaped spring upon. which the said away from the sai armature is pivoted, means for movin spring towardyan 73 The combination of an electromagnet, a

spring held normally under tension, an armature for said magnet, the saidarinaturebelng mounted upon am'ovable; portion of said spring, and means for releasing said spring and allowing it to utilize its tension in; mov-' toward theelectromagnetL 8. The combination of a bracket-plate, a

pair of electromagnets, a permanent magnet, a, strap or clamping-piece for securing together the said 7 bracket-plate, screws extending through both the bracket plate and the saidstrap or clamping-piece and into the cores of said-electror'nagnets, a'- U-shaped spring turned on its side and -straddlir'u; the other pole of. said permanenhmagnet, another strapor clamping- Zso vpermanent magnet :and

piece for securing saidspring and permanent magnet together,-'screws extending through" the said spring and. said last-mentioned strap or clamping-piece, the free portion of said spring being provided with earsg'an arma ture for said electromagnets, means for pivotally mounting said armature upon said ears, athumb-screw connecting the end porand whereby the said he moved toward and away armature may from the cores. of said electromagnets, t0 gether with mature. Signedby. me at Chicago, Cook county, Ilinois, this 25th day of October,'1904. f

' JOHN ERICKSON; Witnesses: y

A. E. KEITH, R. OyGlrronnn a striker secured to the said ar.

as" V 

